Control systems Pressure reducing/surplussing valves
4
Materials (continued)
No. Part
Material Stainless steel Stainless steel
Valve head screw
DN15 and DN20 DN15 and DN20
BS 6105 A2
6
Bush
BS 970 431 S29
8
Balancing bellows gasket
DN25 to DN100
Reinforced exfoiliated graphite Reinforced exfoiliated graphite
11
12
16
12 Bonnet gasket
Steel zinc plated Steel zinc plated Steel zinc plated
15 Pillars
BS 970 230 M07
11
15
16 Pillars nuts
BS 3693 Gr. 8
DN32 to DN50 DN15 to DN25, DN65 to DN100
BS 970 230 M07
25 Lock-nut
Steel zinc plated
BS 3692 Gr. 8
4.6 51
Steel zinc plated Steel zinc plated
28 Setting nut
BS 970 230 M07
DN65 to DN100
DN32 to DN50 DN32 to DN50
29 Bearing plate
BS 1449 Pt1 HR14
30 Circlip
Steel zinc plated
DN15 and DN20
Stainless steel
43 Thread insert
DTD 734
6 (DN15 and DN20 only)
29 30 28
25
43
8
DN15 and DN20
DN32 to DN50
TI-P204-01 CTLS Issue 15
Page 5 of 10
DRV7 and DRV7G SG Iron Pressure Reducing Valves
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